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import os
import time
from pathlib import Path
class CacheMiss(Exception):
pass
class Cache:
def __init__(self, name, ttl=3600):
self.ttl = ttl
try:
self.cache_dir = Path(os.environ['XDG_CACHE_HOME'])/name
except KeyError:
self.cache_dir = Path(os.environ['HOME'])/'.cache'/name
self.cache_dir.mkdir(exist_ok=True)
def write(self, key, value):
# TODO gracefully handle keys with '/' by creating directories or rewriting
loc = self.cache_dir/key
loc.write_text(value, errors='ignore')
def read(self, key):
loc = self.cache_dir/key
if not loc.exists():
raise CacheMiss
age = time.time() - loc.stat().st_mtime
if age > self.ttl:
raise CacheMiss
return loc.read_text()
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